From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Proposal for research into the Aspin rotary valve and its suitability for two-stroke engines.
| Identifier | ExFiles\Box 144\4\ scan0084 | |
| Date | 1st May 1950 | |
| file 11297 2 Stroke Sg.{Arthur F. Sidgreaves - MD} and Hs.{Lord Ernest Hives - Chair} from Rm.{William Robotham - Chief Engineer} c. H.{Arthur M. Hanbury - Head Complaints} c. Rg.{Mr Rowledge} c. Wd.{Mr Wood/Mr Whitehead} c. Lr.{Mr Ellor} c. Lr{Mr Ellor}/Lov.{Mr Lovesey} 1129 Rm.{William Robotham - Chief Engineer}1/ML.1.5.50. PROPOSED RESEARCH ON ASPIN VALVE. About a month ago we went up to have a look at the Aspin engine. Since then, various members of the Aero Division have also visited the Aspin Laboratory. Wood has already pointed out the advantages of the two-stroke fuel injection engine compared with the existing four-stroke arrangement. The poppet valve is not fundamentally suited to two-cycle operation because there is insufficient time to open and close it. It is therefore desirable to investigate alternatives, and the two available are the sleeve valve and rotary valve. The sleeve valve is already being tested in junk head and open ended forms. The Aspin represents the most practical type of rotary valve which we have so far seen. BACKGROUND OF THE ASPIN ENGINE. Aspin is, relatively speaking, a youthful enthusiast, who has been working on his idea for a number of years. He has been over to America to discuss it with people there. He is at present acting as consultant on his particular type of head and valve to a number of motor car manufacturers in this country. He is actually making multi-cylinder engines for Daimler's, Vauxhall's and Ford's. He has a small Experimental Shop employing about 12 people, where he makes all his own bits. The engine he demonstrated to us was 4.125 bore 6" strok engine, out of which he obtained 155 B.M.E.P. at 1,000 r.p.m. whilst we were there, on a fuel alleged to be less than 80 octane rating. - Continued - | ||